Investment decision making by developers of interconnected mini-grid in an underserved electricity distribution network is very critical. This can be achieved by utilizing existing customer data and alternate site characteristics facts available with the utility company. This study developed an investment-based site-selection model (IBSS) that applies the weighted values from pairwise comparison of the criteria and sub-criteria obtained from experts’ judgment survey. The criteria for consideration in the study are Customer Lifetime Value (CLTV) and Site Characteristics (SC). The investigation adopts the multi-criteria decision-making tools of the Interval Type-2 Fuzzy Logic and Analytical Hierarchy Process (IT2F-AHP) to rank the potential sites. The aggregate values of both criteria rankings are obtained to get the final rankings of suitable sites that are arranged based on their weightings and suitability. Interconnected mini-grid investors and developers can use this model in deciding on project geographic coverage area within an underserved electricity distribution network and determine a definite return on investment.

Keywords - Interconnected Mini-grid, Underserved Electricity Distribution Network, Investment-based Site-Selection, Customer Lifetime Value, Site Characteristics